[Bug target/63503] [AArch64] A57 executes fused multiply-add poorly in some situations

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63503

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This might be true for A57 but for our chip (ThunderX), using fused
multiply-add is better.

The other question here are there denormals happening?  That might cause some
performance differences between using fmadd and fmul/fadd.

On most normal processors using fused multiply-add is an improvement also.

Can you attach the preprocessed source and what options you are using?